Preliminaries: Adjust oven rack to middle position and preheat oven to 350 degrees. Grease a 12 inch pizza pan (or a baking sheet) with butter.
Procedure: Prepare brownie mix according to package directions. On prepared pizza pan or baking sheet, press batter into a 12 inch circle. Bake 15-20 minutes in a preheated 350 degree oven. Cool.
Meanwhile, in a mixer bowl or medium mixing bowl, beat cheese until fluffy. Gradually beat in sweetened condensed milk until smooth. Stir in juice concentrate and vanilla; chill thoroughly.
Spoon filling over brownie crust. Dip banana slices in lemon juice; drain well. Arrange bananas, strawberries and nuts on top. In small saucepan, over low heat, melt chocolate with butter; drizzle over top. Chill until set, about 1 hour.
Presentation: Cut into pie shape wedges and serve.
Yield: Makes one 12 inch dessert pizza.